These tests are measured by Sound & Vision and HT Labs, and you’ll nearly always find that in depth tests differ sometimes quite a lot to the average mean specs manufactures print, you just need to look at Stereophiles in depth bench test and compare to the manufacturers quoted spec.
Here is a bit more to look at from the Toy Tower test as done by Sound & Vision HT Labs.
"The Toy Tower’s listening-window response (a five-point average of axial and +/–15-degree horizontal and vertical responses) measures +0.99/–3.79 decibels from 200 hertz to 10 kilohertz. The –3-dB point is at 84 Hz, and the –6-dB point is at 61 Hz. Impedance reaches a minimum of 4.96 ohms at 141 Hz and a phase angle of –56.28 degrees at 69 Hz. L/R Sensitivity: 87 dB from 500 Hz to 2 kHz"
Cheers George